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hw/arm/virt: Allow virt extensions with KVM

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Up to now virt support on guest has been only supported with TCG.
Now it becomes feasible to use it with KVM acceleration.

Check neither in-kernel GICv3 nor aarch64=off is used along with KVM
EL2.

Signed-off-by: Haibo Xu <haibo.xu@linaro.org>
Signed-off-by: Miguel Luis <miguel.luis@oracle.com>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250707164129.1167837-6-eric.auger@redhat.com
[PMM: make "kernel doesn't have EL2 support" error message
 distinct from the old "QEMU doesn't have KVM EL2 support" one]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2025-07-10 11:39:33 +01:00
parent f36032440f
commit 851dcb8355
1 changed files with 18 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

19
hw/arm/virt.c
View file

@ -797,6 +797,13 @@ static void create_gic(VirtMachineState *vms, MemoryRegion *mem)
default:
g_assert_not_reached();
}
if (kvm_enabled() && vms->virt &&
(revision != 3 || !kvm_irqchip_in_kernel())) {
error_report("KVM EL2 is only supported with in-kernel GICv3");
exit(1);
}
vms->gic = qdev_new(gictype);
qdev_prop_set_uint32(vms->gic, "revision", revision);
qdev_prop_set_uint32(vms->gic, "num-cpu", smp_cpus);
@ -2092,6 +2099,10 @@ static void virt_post_cpus_gic_realized(VirtMachineState *vms,
memory_region_init_ram(pvtime, NULL, "pvtime", pvtime_size, NULL);
memory_region_add_subregion(sysmem, pvtime_reg_base, pvtime);
}
if (!aarch64 && vms->virt) {
error_report("KVM does not support EL2 on an AArch32 vCPU");
exit(1);
}
CPU_FOREACH(cpu) {
if (pmu) {
@ -2237,7 +2248,13 @@ static void machvirt_init(MachineState *machine)
exit(1);
}
if (vms->virt && !tcg_enabled() && !qtest_enabled()) {
if (vms->virt && kvm_enabled() && !kvm_arm_el2_supported()) {
error_report("mach-virt: host kernel KVM does not support providing "
"Virtualization extensions to the guest CPU");
exit(1);
}
if (vms->virt && !kvm_enabled() && !tcg_enabled() && !qtest_enabled()) {
error_report("mach-virt: %s does not support providing "
"Virtualization extensions to the guest CPU",
current_accel_name());